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collars for dumbell

I would also say flame or plasma cut. Your later pictures show more detail. I sometimes lay a tape measure extended beside the part I am photographing to give a size reference in the photo. I find it helps when I refer to it later. I'm guessing you want to make some of these? Depending on how you are equipped and how many you want to make you could also machine them from solid bar or cut them from heavy walled tubing if you can find it in the right dimensions at a reasonable price. Plasma does do an acceptable job though.---Meltedmetal

Cost effectiveness would depend on the equipment available and the number required. If I understand the Bossman, the center hole is 2 inches. They appear to be taller than they are thick and he says they are 1/2 thick so that would make the OD somewhere over 3 inches.
Meltedmetal

And my eyesight isn't what it used to be but I see torch marks. Haha. Mm

collars for dumbell

Hate to keep repeating myself but they are not punch out of flat stock. These are 100% not die marks a die and punch will leave a sheared edge because that I what it does. As far as being cost affective when you double punch something you will always have distortion these do not show the "pull thru" And that means that if you did punch em you would have to flatten em. Making it cost much much more.

collars for dumbell

I see. You would get better information if you would have asked for suggestions on how people recommend you go about making your own. Otherwise people were just thinking you wanted to know how those exact ones were made.